From AlphaWiki

Placing images in pages

To place an image into a page, enter the address (url) of the image into the markup text. Any alternate text (used for tooltips and for browsers that do not display images) is placed in double quotes immediately following the image url.

http://www.pmichaud.com/img/misc/pc.jpg"Paper clips"
Paper clips are fun to work with.

Paper clips are fun to work with.

Images can also be specified as uploaded files (i.e., Attach:image.jpg) and using InterMap links. Any file that ends in .gif, .jpg, .jpeg, or .png will be automatically treated as an image. (See Notes below for image files that lack extensions.)

To create a link to an image (like http://www.pmichaud.com/img/misc/pc.jpg as opposed to displaying the image itself), use double brackets to mark the link, as in [[http://www.pmichaud.com/img/misc/pc.jpg]] or [[Attach:image.jpg]].

To have an image link to another location, use the image as the link text as in [[http://www.pmwiki.org | Attach:image.jpg"PmWiki"]].

Captions and floating images

A caption can be added to an image using a vertical brace and the caption text.

http://www.pmichaud.com/img/misc/pc.jpg"Paper clips" | '''Figure 1'''

Figure 1

Normally, images are displayed "in line" with the surrounding text. To left or right-align an image with text wrapping around it, use the %lfloat% or %rfloat%WikiStyles.

Notes

An image file that lacks a correct extension can be displayed by addition of a "false" extension to the URL. For example, if the url is http://www.example.com/script/tux, add a fake query string on the end with the desired extension (e.g., http://www.example.com/script/tux?format=.png). If query strings are unsuitable, a fragment identifier should work, e.g. http://www.example.com/script/tux#file.png.